Syria’s official SANA news agency reported on Wednesday that the chemical materials were found by an army unit in a depot in the Old City of Aleppo.

Sulfur, chlorine and raw materials used for plastic granules were among the Saudi substances discovered, the report added.

It further noted that militants used the materials for manufacturing explosives that were later employed for targeting Aleppo’s residential areas.

It was not the first time that the Syrian troops uncovered toxic chemicals stored by Takfiri terrorists in Aleppo.

In December, Syrian military forces found a chemical warehouse inside Sana’a Mehaidali school in Aleppo’s Masaken Hanano neighborhood.

Terrorist groups such as Daesh and Jabhat Fateh al-Sham, formerly known as al-Nusra Front, have on several occasions used toxic materials to target civilians in the Aleppo areas.

The Syrian government has accused Saudi Arabia, Qatar, and Turkey of providing the militants with the banned weapons.

The picture shows Aleppo's former militant-held Ansari district on December 23, 2016, after Syrian government forces retook control of the whole city. (Photo by AFP)

Last month, the Syrian army established full control over Aleppo, which had long been divided between government forces in the west and the militants in the east.

Aleppo's liberation was interpreted as a crushing blow to the militants and their foreign supporters, who have been actively working to unseat the government of Syrian President Bashar al-Assad since March 2011.